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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.base;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.GwtCompatible;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Arrays;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.LinkedList;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.List;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import javax.annotation.Nullable;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>/**<a name="line.30"></a>
<span class="sourceLineNo">031</span> * Helper functions that can operate on any {@code Object}.<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;p&gt;See the Guava User Guide on &lt;a<a name="line.33"></a>
<span class="sourceLineNo">034</span> * href="http://code.google.com/p/guava-libraries/wiki/CommonObjectUtilitiesExplained"&gt;writing<a name="line.34"></a>
<span class="sourceLineNo">035</span> * {@code Object} methods with {@code Objects}&lt;/a&gt;.<a name="line.35"></a>
<span class="sourceLineNo">036</span> *<a name="line.36"></a>
<span class="sourceLineNo">037</span> * @author Laurence Gonsalves<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @since 2.0 (imported from Google Collections Library)<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span>@GwtCompatible<a name="line.40"></a>
<span class="sourceLineNo">041</span>public final class Objects {<a name="line.41"></a>
<span class="sourceLineNo">042</span>  private Objects() {}<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>  /**<a name="line.44"></a>
<span class="sourceLineNo">045</span>   * Determines whether two possibly-null objects are equal. Returns:<a name="line.45"></a>
<span class="sourceLineNo">046</span>   *<a name="line.46"></a>
<span class="sourceLineNo">047</span>   * &lt;ul&gt;<a name="line.47"></a>
<span class="sourceLineNo">048</span>   * &lt;li&gt;{@code true} if {@code a} and {@code b} are both null.<a name="line.48"></a>
<span class="sourceLineNo">049</span>   * &lt;li&gt;{@code true} if {@code a} and {@code b} are both non-null and they are<a name="line.49"></a>
<span class="sourceLineNo">050</span>   *     equal according to {@link Object#equals(Object)}.<a name="line.50"></a>
<span class="sourceLineNo">051</span>   * &lt;li&gt;{@code false} in all other situations.<a name="line.51"></a>
<span class="sourceLineNo">052</span>   * &lt;/ul&gt;<a name="line.52"></a>
<span class="sourceLineNo">053</span>   *<a name="line.53"></a>
<span class="sourceLineNo">054</span>   * &lt;p&gt;This assumes that any non-null objects passed to this function conform<a name="line.54"></a>
<span class="sourceLineNo">055</span>   * to the {@code equals()} contract.<a name="line.55"></a>
<span class="sourceLineNo">056</span>   */<a name="line.56"></a>
<span class="sourceLineNo">057</span>  public static boolean equal(@Nullable Object a, @Nullable Object b) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>    return a == b || (a != null &amp;&amp; a.equals(b));<a name="line.58"></a>
<span class="sourceLineNo">059</span>  }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>  /**<a name="line.61"></a>
<span class="sourceLineNo">062</span>   * Generates a hash code for multiple values. The hash code is generated by<a name="line.62"></a>
<span class="sourceLineNo">063</span>   * calling {@link Arrays#hashCode(Object[])}.<a name="line.63"></a>
<span class="sourceLineNo">064</span>   *<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * &lt;p&gt;This is useful for implementing {@link Object#hashCode()}. For example,<a name="line.65"></a>
<span class="sourceLineNo">066</span>   * in an object that has three properties, {@code x}, {@code y}, and<a name="line.66"></a>
<span class="sourceLineNo">067</span>   * {@code z}, one could write:<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * &lt;pre&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * public int hashCode() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>   *   return Objects.hashCode(getX(), getY(), getZ());<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * }&lt;/pre&gt;<a name="line.71"></a>
<span class="sourceLineNo">072</span>   *<a name="line.72"></a>
<span class="sourceLineNo">073</span>   * &lt;b&gt;Warning&lt;/b&gt;: When a single object is supplied, the returned hash code<a name="line.73"></a>
<span class="sourceLineNo">074</span>   * does not equal the hash code of that object.<a name="line.74"></a>
<span class="sourceLineNo">075</span>   */<a name="line.75"></a>
<span class="sourceLineNo">076</span>  public static int hashCode(@Nullable Object... objects) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>    return Arrays.hashCode(objects);<a name="line.77"></a>
<span class="sourceLineNo">078</span>  }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>  /**<a name="line.80"></a>
<span class="sourceLineNo">081</span>   * Creates an instance of {@link ToStringHelper}.<a name="line.81"></a>
<span class="sourceLineNo">082</span>   *<a name="line.82"></a>
<span class="sourceLineNo">083</span>   * &lt;p&gt;This is helpful for implementing {@link Object#toString()}.<a name="line.83"></a>
<span class="sourceLineNo">084</span>   * Specification by example: &lt;pre&gt;   {@code<a name="line.84"></a>
<span class="sourceLineNo">085</span>   *   // Returns "ClassName{}"<a name="line.85"></a>
<span class="sourceLineNo">086</span>   *   Objects.toStringHelper(this)<a name="line.86"></a>
<span class="sourceLineNo">087</span>   *       .toString();<a name="line.87"></a>
<span class="sourceLineNo">088</span>   *<a name="line.88"></a>
<span class="sourceLineNo">089</span>   *   // Returns "ClassName{x=1}"<a name="line.89"></a>
<span class="sourceLineNo">090</span>   *   Objects.toStringHelper(this)<a name="line.90"></a>
<span class="sourceLineNo">091</span>   *       .add("x", 1)<a name="line.91"></a>
<span class="sourceLineNo">092</span>   *       .toString();<a name="line.92"></a>
<span class="sourceLineNo">093</span>   *<a name="line.93"></a>
<span class="sourceLineNo">094</span>   *   // Returns "MyObject{x=1}"<a name="line.94"></a>
<span class="sourceLineNo">095</span>   *   Objects.toStringHelper("MyObject")<a name="line.95"></a>
<span class="sourceLineNo">096</span>   *       .add("x", 1)<a name="line.96"></a>
<span class="sourceLineNo">097</span>   *       .toString();<a name="line.97"></a>
<span class="sourceLineNo">098</span>   *<a name="line.98"></a>
<span class="sourceLineNo">099</span>   *   // Returns "ClassName{x=1, y=foo}"<a name="line.99"></a>
<span class="sourceLineNo">100</span>   *   Objects.toStringHelper(this)<a name="line.100"></a>
<span class="sourceLineNo">101</span>   *       .add("x", 1)<a name="line.101"></a>
<span class="sourceLineNo">102</span>   *       .add("y", "foo")<a name="line.102"></a>
<span class="sourceLineNo">103</span>   *       .toString();<a name="line.103"></a>
<span class="sourceLineNo">104</span>   *   }}<a name="line.104"></a>
<span class="sourceLineNo">105</span>   *<a name="line.105"></a>
<span class="sourceLineNo">106</span>   *   // Returns "ClassName{x=1}"<a name="line.106"></a>
<span class="sourceLineNo">107</span>   *   Objects.toStringHelper(this)<a name="line.107"></a>
<span class="sourceLineNo">108</span>   *       .omitNullValues()<a name="line.108"></a>
<span class="sourceLineNo">109</span>   *       .add("x", 1)<a name="line.109"></a>
<span class="sourceLineNo">110</span>   *       .add("y", null)<a name="line.110"></a>
<span class="sourceLineNo">111</span>   *       .toString();<a name="line.111"></a>
<span class="sourceLineNo">112</span>   *   }}&lt;/pre&gt;<a name="line.112"></a>
<span class="sourceLineNo">113</span>   *<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * &lt;p&gt;Note that in GWT, class names are often obfuscated.<a name="line.114"></a>
<span class="sourceLineNo">115</span>   *<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * @param self the object to generate the string for (typically {@code this}),<a name="line.116"></a>
<span class="sourceLineNo">117</span>   *        used only for its class name<a name="line.117"></a>
<span class="sourceLineNo">118</span>   * @since 2.0<a name="line.118"></a>
<span class="sourceLineNo">119</span>   */<a name="line.119"></a>
<span class="sourceLineNo">120</span>  public static ToStringHelper toStringHelper(Object self) {<a name="line.120"></a>
<span class="sourceLineNo">121</span>    return new ToStringHelper(simpleName(self.getClass()));<a name="line.121"></a>
<span class="sourceLineNo">122</span>  }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>  /**<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * Creates an instance of {@link ToStringHelper} in the same manner as<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * {@link Objects#toStringHelper(Object)}, but using the name of {@code clazz}<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * instead of using an instance's {@link Object#getClass()}.<a name="line.127"></a>
<span class="sourceLineNo">128</span>   *<a name="line.128"></a>
<span class="sourceLineNo">129</span>   * &lt;p&gt;Note that in GWT, class names are often obfuscated.<a name="line.129"></a>
<span class="sourceLineNo">130</span>   *<a name="line.130"></a>
<span class="sourceLineNo">131</span>   * @param clazz the {@link Class} of the instance<a name="line.131"></a>
<span class="sourceLineNo">132</span>   * @since 7.0 (source-compatible since 2.0)<a name="line.132"></a>
<span class="sourceLineNo">133</span>   */<a name="line.133"></a>
<span class="sourceLineNo">134</span>  public static ToStringHelper toStringHelper(Class&lt;?&gt; clazz) {<a name="line.134"></a>
<span class="sourceLineNo">135</span>    return new ToStringHelper(simpleName(clazz));<a name="line.135"></a>
<span class="sourceLineNo">136</span>  }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>  /**<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * Creates an instance of {@link ToStringHelper} in the same manner as<a name="line.139"></a>
<span class="sourceLineNo">140</span>   * {@link Objects#toStringHelper(Object)}, but using {@code className} instead<a name="line.140"></a>
<span class="sourceLineNo">141</span>   * of using an instance's {@link Object#getClass()}.<a name="line.141"></a>
<span class="sourceLineNo">142</span>   *<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * @param className the name of the instance type<a name="line.143"></a>
<span class="sourceLineNo">144</span>   * @since 7.0 (source-compatible since 2.0)<a name="line.144"></a>
<span class="sourceLineNo">145</span>   */<a name="line.145"></a>
<span class="sourceLineNo">146</span>  public static ToStringHelper toStringHelper(String className) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>    return new ToStringHelper(className);<a name="line.147"></a>
<span class="sourceLineNo">148</span>  }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span>  /**<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * {@link Class#getSimpleName()} is not GWT compatible yet, so we<a name="line.151"></a>
<span class="sourceLineNo">152</span>   * provide our own implementation.<a name="line.152"></a>
<span class="sourceLineNo">153</span>   */<a name="line.153"></a>
<span class="sourceLineNo">154</span>  private static String simpleName(Class&lt;?&gt; clazz) {<a name="line.154"></a>
<span class="sourceLineNo">155</span>    String name = clazz.getName();<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    // the nth anonymous class has a class name ending in "Outer$n"<a name="line.157"></a>
<span class="sourceLineNo">158</span>    // and local inner classes have names ending in "Outer.$1Inner"<a name="line.158"></a>
<span class="sourceLineNo">159</span>    name = name.replaceAll("\\$[0-9]+", "\\$");<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span>    // we want the name of the inner class all by its lonesome<a name="line.161"></a>
<span class="sourceLineNo">162</span>    int start = name.lastIndexOf('$');<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    // if this isn't an inner class, just find the start of the<a name="line.164"></a>
<span class="sourceLineNo">165</span>    // top level class name.<a name="line.165"></a>
<span class="sourceLineNo">166</span>    if (start == -1) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>      start = name.lastIndexOf('.');<a name="line.167"></a>
<span class="sourceLineNo">168</span>    }<a name="line.168"></a>
<span class="sourceLineNo">169</span>    return name.substring(start + 1);<a name="line.169"></a>
<span class="sourceLineNo">170</span>  }<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span>  /**<a name="line.172"></a>
<span class="sourceLineNo">173</span>   * Returns the first of two given parameters that is not {@code null}, if<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * either is, or otherwise throws a {@link NullPointerException}.<a name="line.174"></a>
<span class="sourceLineNo">175</span>   *<a name="line.175"></a>
<span class="sourceLineNo">176</span>   * &lt;p&gt;&lt;b&gt;Note:&lt;/b&gt; if {@code first} is represented as an {@code Optional&lt;T&gt;},<a name="line.176"></a>
<span class="sourceLineNo">177</span>   * this can be accomplished with {@code first.or(second)}. That approach also<a name="line.177"></a>
<span class="sourceLineNo">178</span>   * allows for lazy evaluation of the fallback instance, using<a name="line.178"></a>
<span class="sourceLineNo">179</span>   * {@code first.or(Supplier)}.<a name="line.179"></a>
<span class="sourceLineNo">180</span>   *<a name="line.180"></a>
<span class="sourceLineNo">181</span>   * @return {@code first} if {@code first} is not {@code null}, or<a name="line.181"></a>
<span class="sourceLineNo">182</span>   *     {@code second} if {@code first} is {@code null} and {@code second} is<a name="line.182"></a>
<span class="sourceLineNo">183</span>   *     not {@code null}<a name="line.183"></a>
<span class="sourceLineNo">184</span>   * @throws NullPointerException if both {@code first} and {@code second} were<a name="line.184"></a>
<span class="sourceLineNo">185</span>   *     {@code null}<a name="line.185"></a>
<span class="sourceLineNo">186</span>   * @since 3.0<a name="line.186"></a>
<span class="sourceLineNo">187</span>   */<a name="line.187"></a>
<span class="sourceLineNo">188</span>  public static &lt;T&gt; T firstNonNull(@Nullable T first, @Nullable T second) {<a name="line.188"></a>
<span class="sourceLineNo">189</span>    return first != null ? first : checkNotNull(second);<a name="line.189"></a>
<span class="sourceLineNo">190</span>  }<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>  /**<a name="line.192"></a>
<span class="sourceLineNo">193</span>   * Support class for {@link Objects#toStringHelper}.<a name="line.193"></a>
<span class="sourceLineNo">194</span>   *<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * @author Jason Lee<a name="line.195"></a>
<span class="sourceLineNo">196</span>   * @since 2.0<a name="line.196"></a>
<span class="sourceLineNo">197</span>   */<a name="line.197"></a>
<span class="sourceLineNo">198</span>  public static final class ToStringHelper {<a name="line.198"></a>
<span class="sourceLineNo">199</span>    private final String className;<a name="line.199"></a>
<span class="sourceLineNo">200</span>    private final List&lt;ValueHolder&gt; valueHolders =<a name="line.200"></a>
<span class="sourceLineNo">201</span>        new LinkedList&lt;ValueHolder&gt;();<a name="line.201"></a>
<span class="sourceLineNo">202</span>    private boolean omitNullValues = false;<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>    /**<a name="line.204"></a>
<span class="sourceLineNo">205</span>     * Use {@link Objects#toStringHelper(Object)} to create an instance.<a name="line.205"></a>
<span class="sourceLineNo">206</span>     */<a name="line.206"></a>
<span class="sourceLineNo">207</span>    private ToStringHelper(String className) {<a name="line.207"></a>
<span class="sourceLineNo">208</span>      this.className = checkNotNull(className);<a name="line.208"></a>
<span class="sourceLineNo">209</span>    }<a name="line.209"></a>
<span class="sourceLineNo">210</span><a name="line.210"></a>
<span class="sourceLineNo">211</span>    /**<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * When called, the formatted output returned by {@link #toString()} will<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * ignore {@code null} values.<a name="line.213"></a>
<span class="sourceLineNo">214</span>     *<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * @since 12.0<a name="line.215"></a>
<span class="sourceLineNo">216</span>     */<a name="line.216"></a>
<span class="sourceLineNo">217</span>    @Beta<a name="line.217"></a>
<span class="sourceLineNo">218</span>    public ToStringHelper omitNullValues() {<a name="line.218"></a>
<span class="sourceLineNo">219</span>      omitNullValues = true;<a name="line.219"></a>
<span class="sourceLineNo">220</span>      return this;<a name="line.220"></a>
<span class="sourceLineNo">221</span>    }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>    /**<a name="line.223"></a>
<span class="sourceLineNo">224</span>     * Adds a name/value pair to the formatted output in {@code name=value}<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * format. If {@code value} is {@code null}, the string {@code "null"}<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * is used, unless {@link #omitNullValues()} is called, in which case this<a name="line.226"></a>
<span class="sourceLineNo">227</span>     * name/value pair will not be added.<a name="line.227"></a>
<span class="sourceLineNo">228</span>     */<a name="line.228"></a>
<span class="sourceLineNo">229</span>    public ToStringHelper add(String name, @Nullable Object value) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>      checkNotNull(name);<a name="line.230"></a>
<span class="sourceLineNo">231</span>      addHolder(value).builder.append(name).append('=').append(value);<a name="line.231"></a>
<span class="sourceLineNo">232</span>      return this;<a name="line.232"></a>
<span class="sourceLineNo">233</span>    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Adds a name/value pair to the formatted output in {@code name=value}<a name="line.236"></a>
<span class="sourceLineNo">237</span>     * format.<a name="line.237"></a>
<span class="sourceLineNo">238</span>     *<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * @since 11.0 (source-compatible since 2.0)<a name="line.239"></a>
<span class="sourceLineNo">240</span>     */<a name="line.240"></a>
<span class="sourceLineNo">241</span>    public ToStringHelper add(String name, boolean value) {<a name="line.241"></a>
<span class="sourceLineNo">242</span>      checkNameAndAppend(name).append(value);<a name="line.242"></a>
<span class="sourceLineNo">243</span>      return this;<a name="line.243"></a>
<span class="sourceLineNo">244</span>    }<a name="line.244"></a>
<span class="sourceLineNo">245</span><a name="line.245"></a>
<span class="sourceLineNo">246</span>    /**<a name="line.246"></a>
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</pre>
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